Condensed isothiazolo-3 (2H)-one-1-1-dioxides

Abstract

Compounds of the formula <IMAGE> wherein X is oxygen or sulfur; R1 is hydrogen, methyl or ethyl; and R2 is methyl or ethyl; and non-toxic, physiologically acceptable salts thereof formed with an inorganic or organic base. The compounds as well as their salts are useful as sweetening agents.

We claim: 
     
       1. A compound of the formula ##STR6## wherein X is oxygen or sulfur; R 1  is hydrogen, methyl or ethyl; and   R 2  is methyl or ethyl; provided, however, that when X is sulfur R 1  and R 2  are other than both methyl; or a non-toxic salt thereof formed with an inorganic or organic base.     
     
     
       2. A compound of claim 1, which is 5-methyl-thieno-[3,2-d]isothiazole-3(2H)-one-1,1-dioxide or a non-toxic salt thereof formed with an inorganic or organic base. 
     
     
       3. A sweetening composition for foods and beverages consisting essentially of an inert carrier and an effective sweetening amount of a compound of claim 1. 
     
     
       4. The method of sweetening foods and beverages which composes adding thereto an effective sweetening amount of a compound of claim 1.